【正确答案】：
A. HIS WORDS ARE COLLOQUIAL, CONCRETE AND DIRECT IN EFFECT, AND HIS SENTENCE STRUCTURE ARE SIMPLE, EVEN UNGRAMMATICAL SPOKEN LANGUAGE.
B. HIS CHARACTERS SPEAK WITH A STRONG ACCENT, WHICH IS TRUE OF HIS LOCAL COLORISM.
C. DIFFERENT CHARACTERS FROM DIFFERENT LITERARY OR CULTURAL BACKGROUDS TALK DIFFERENTLY.
【题目解析】：本题考查了马克·吐温小说中的语言特色。1.小说行文特点：他的语言口语化、具体、直接，并且句子结构简单，有时候甚至不符合语法。2.小说人物语言特点：他小说中的人物说话带有浓重的口音，也正符合他故乡的当地特色。3.作品间人物特点对比：他笔下来自不同文学或文化背景的不同人物说话方式亦不同。